Emission: Red glow while the object itself is white
If you really want to use Cycles: Add a box which encloses the entire scene, add a principled volume shader to the box and play with Density and Anisotropy:



In comp you can add a Denoise node to save render time and a Glare node to introduce a soft glow:







If the volume takes forever to render, a few blur nodes with various blur amounts can introduce a 'colorful blur' in comp as well: